Improvement in grooving-machines



J. W. SMITH.

' GRooVING MACHINE.

No. 108,943. Patented Nov. l, 1870.

man Walla/wlan a .mijn 6,950 '5" liu/wohl.

l M @PQM tanta Letters Patent No. 108,943, dated `November 1, 1.870,1

'MPRovsm-:NT m @nomine-MACHINES. V

The Schedule referred to h1 these Letters Patent and making 'part of the same.

description of the consti-notion and operation of the same, reference being had to the annexed drawing making a part of this specification, and tothe letters and figures of reference marked thereon.- v

. My invention relates to Ineans for ni 'king or slotting screw-heads, and for cutting grooves in lmetal or ,J wood, and consists in arranging-'and fastening a suc.

cession of separate reversible teeth or cutters between two plat-es, which are screwed together and provided with an adjustable bearing-plate, to be set up against the ends of the teeth, according to requirement, as they become shorter by use. rlhe letter A of the drawing designates the plates, between which the teeth or cutters are held.

These plates may have dilercut forms, according to the mode of using the cutter.

The cutters z z are parallelogiams, with the ends' oblique to .the sides.

Either end of the tooth is' adapted to be used in the cutting operation, and it is found convenient in practice to reverse lthem until both edges are worn dull.

As they will become shorter whemground-,mljustf able bearing-plates s s are employed to set` them up tothe proper position.

Thesebearing-plates are placed between the plates A A, andare adjusted by set-screws.

My invention is'designed to result in thc saving of' much time and labor, as well as material.

I am aware that reversible bits have been used in reamers and planer-s. I do not claim such; but

'What I claim as my invent-ion, and desireto secure by Letters Patent, is

-teeth ,of-z, and the adjustable bearing-platess s. substantially as shown and described.

In testimony that I claimv the above, I have here-- unto subscribed my name in the Vpreseuce'of two witnesses.

JAR-ED W- SMITH.

Witnesses:

NICHOLAS HARRIS,

JOHN T. PETERS.

am coffre;

lhe' plates A A, in combination with the reversible. 

